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Question

Two charges q1 and q2 are kept on x axis and electric field at different points on x axis is plotted against x. Choose correct statement about nature and magnitude of q1 and q2.


A
q1+ve, q2ve; |q1|>|q2|
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B
q1+ve, q2ve; |q1|<|q2|
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C
q1ve, q2+ve; |q1|>|q2|
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D
q1ve, q2+ve; |q1|<|q2|
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Solution

The correct option is C q1ve, q2+ve; |q1|>|q2|

We can see from the graph that:

(1).
Just to the left of q1, the electric field is +α (let) or toward right (toward q1).
Hence, q1 is negative because x is negative and E is positive.

(2).
Just to the right of q2, the electric field is +α (let) or toward right (away from q2).
Hence, q2 is positive because x is positive and E is positive.

(3).
Enet=0 near q2.
Hence, |q1|>|q2| because Eqr2

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